feat(galaxy): multi-disk galaxy generation with tab-based UI
- Add multi-disk support (up to 4 independent disk layers) with per-disk arms, twist, tilt, rotation, inner/outer radius - Add polar beams (top/bottom) with taper, gravity, thickness controls - Implement tab-based disk selector UI with add/remove disk - Add Randomize Settings button for full param randomization - Add Regenerate (reseed) and Center View buttons - Add per-system contents generation (planets, belts, stations, anomalies, gas clouds, stargates) with orbital mechanics - Refactor control panel into scrollable sections with value display
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